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Weighted Average Shares Outstanding - Schedule of Basic and Diluted Common Shares Outstanding, Calculated on Weighted Average Basis (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Basic shares outstanding	111,550,424	113,733,118
Share options (dilutive effect in 2019 of 107,168 options; 2018 – 507,066 options)		89,200
Diluted shares	111,550,424	113,822,318

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2019-03-27

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X

- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2019-01-01
-Paragraph 70
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- References

No definition available.

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2019-01-01
-Paragraph 70
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-URIDate 2019-03-27

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